Improvement in grate-bars



A. F. CRUWEVLL.

Grate-Bars. A Patented Nov. 24,1874. N0.l57,091.

Q 6MM@ Atry,

THE GRAPHIC C0. PHUTYp-LITIIJB! 4| PARK PLACBNM UNITED STATES PATENT OFFICE.

ALPHONSO F. CROWELL, OF HYANNIS, MASSACHUSETTS, ASSIGNOR TO GEORGE H. CLARKE; OF BROOKLYN, NEW YORK.

IMPROVEMENT IN GRATE-BARS.

Specification forming part of Letters Patent No. 157,09 l, dated November 24, 1874; application filed September 8, 1874.

To all lwhom it may concern:

Beit known that I, ALrHoNso F. CROW- ELL, of Hyannis, county of Barnstable and State of Massachusetts, have invented certain Improvements in Grate-Bars, of which the following is a specification:

My invention relates to interlocking gratebars, and has for its object to admit of the bars being taken apart from the middle of the grate, as will be fully hereinafter set forth.

Figure 1 is a plan view of a series of bars; Fig. 2, aplan view of the bars separated; Fig. 3, a transverse section of Fig. 1 through the line.

A B G represent two series of bars, three in each series, as shown; but this number may be increased, as desired. The two outside bars a b have similar recessed projections c c cast on each side, and the middle bar has the tenons or projections d on each side, which, when the bars are put together, form a mortise-andtenon joint, thus preventing the bars from rising. At each extremity ofthe bar are projections c c, also alike on both sides, which receive the projections f on the bars. 1n the middle ofthe grate is a plain bar, O, which can be readily removed to allow the other bars ou either side of it to be taken out from the middle of the grate.

I claiml The key-bar C, in combination with the series of locked bars A B, which can be readily removed for taking the grate apart from the inddle, substantially as described and speci- ALPHONSO F. GROWELL.

Witnesses:

J. P. CRAWFORD, E. H. JoHNsoN. 

